package com.example.demoa;
import android.content.ContentValues;
import android.content.Intent;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.text.Editable;
import android.text.TextWatcher;
import android.view.View;
import android.widget.AdapterView;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.ListView;

import java.io.File;
import java.util.ArrayList;

public class MainActivity extends AppCompatActivity
        implements IOnDataChangeListener {
    private EditText edtKey;
    private ImageView ivSearch;
    private ListView lvStu;
    private Button btnAdd;
    private ArrayList<Student> studentArrayList = new ArrayList<>();
    private StuAdapter adapter;
    private StudbOpenHelper studbOpenHelper;



    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        studbOpenHelper = new StudbOpenHelper(MainActivity.this,
                "stu.db", null, 1);
        findViews();

//        initStudentArrayList();

        adapter = new StuAdapter(MainActivity.this, studentArrayList, MainActivity.this);
        readDataFromDB();

        lvStu.setAdapter(adapter);
        lvStu.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {
                Student student = studentArrayList.get(i);
                Intent intent = new Intent();
                intent.setClass(MainActivity.this, EditActivity.class);
                intent.putExtra("STUNO", student.getStuno());
                intent.putExtra("NAME", student.getName());
                intent.putExtra("AGE", student.getAge());
                startActivityForResult(intent, 1002);

                edtKey.addTextChangedListener(new TextWatcher(){

                    @Override
                    public void beforeTextChanged(CharSequence charSequence, int i, int i1, int i2) {

                    }

                    @Override
                    public void onTextChanged(CharSequence charSequence, int i, int i1, int i2) {

                    }

                    @Override
                    public void afterTextChanged(Editable editable) {
                        String key =edtKey.getText().toString();
                        searchFromDB(key);
                    }
                });
            }
        });
    }



    private void initStudentArrayList() {
        studentArrayList.add(new Student("17001","lisa", 18));
        studentArrayList.add(new Student("17002","lier", 18));
        studentArrayList.add(new Student("17003","liwu", 18));
        studentArrayList.add(new Student("17004","liqi", 18));
    }

    private void findViews() {
        lvStu = findViewById(R.id.lv_stu);
        btnAdd = findViewById(R.id.btn_add);

        btnAdd.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Intent intent = new Intent();
                intent.setClass(MainActivity.this, AddActivity.class);
                startActivityForResult(intent, 1001);
            }
        });

        edtKey = findViewById(R.id.edt_key);
        ivSearch = findViewById(R.id.iv_search);
        ivSearch.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                String key = edtKey.getText().toString();
                searchFromDB(key);
            }
        });
    }

    private void searchFromDB(String key) {
        //String path = getFilesDir().getAbsolutePath() + File.separator + "stu.db";
        SQLiteDatabase db = studbOpenHelper.getReadableDatabase();
        //SQLiteDatabase.openOrCreateDatabase(path, null);

        String where = "name like '%" + key +"%' OR stuno like '%" + key +"%' " +
                "OR age = '" + key+" ' ";

        studentArrayList.clear();
        Cursor cursor = db.query("student", null, where,
                null,null,null,null,null);

        if(cursor != null && cursor.getCount() > 0){
            for(cursor.moveToFirst(); !cursor.isAfterLast(); cursor.moveToNext()){
                String stuno = cursor.getString(0);
                String name = cursor.getString(1);
                int age = cursor.getInt(2);

                Student  student = new Student(stuno, name, age);
                studentArrayList.add(student);
            }
        }

        adapter.notifyDataSetChanged();

        cursor.close();
        db.close();

    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        if(resultCode == 2001){
            String stuno = data.getStringExtra("STUNO");
            String name = data.getStringExtra("NAME");
            int age = data.getIntExtra("AGE", 0);

            Student student =  new Student(stuno, name, age);
            addStudentToDB(student);
        }else if(resultCode == 3001){
            String stuno = data.getStringExtra("STUNO");
            String name = data.getStringExtra("NAME");
            int age = data.getIntExtra("AGE", 0);

            Student student =  new Student(stuno, name, age);
            updateStudentToDB(student);
        }
    }

    private void updateStudentToDB(Student student) {
        //String path = getFilesDir().getAbsolutePath() + File.separator + "stu.db";
        SQLiteDatabase db = studbOpenHelper.getWritableDatabase();
        //SQLiteDatabase.openOrCreateDatabase(path, null);

        /** 绗竴绉?缁勮璇彞
         String sql = "update student set name = '"+student.getName()+"'," +
         " age = "+student.getAge()+" where stuno = '"+student.getStuno()+"'";
         db.execSQL(sql);
         db.close();
         readDataFromDB();*/

        // 绗簩绉嶆柟寮?update
        ContentValues values = new ContentValues();
        values.put("name", student.getName());
        values.put("age", student.getAge());
        String where = "stuno = '"+student.getStuno()+"'";
        db.update("student", values, where, null);
        db.close();
        readDataFromDB();

    }

    private void addStudentToDB(Student student) {
        //String path = getFilesDir().getAbsolutePath() + File.separator + "stu.db";
        SQLiteDatabase db = studbOpenHelper.getWritableDatabase();
        //SQLiteDatabase.openOrCreateDatabase(path, null);

        ContentValues values = new ContentValues();
        values.put("stuno", student.getStuno());
        values.put("name", student.getName());
        values.put("age", student.getAge());

        db.insert("student", null, values);
        db.close();
        readDataFromDB();
    }

    @Override
    public void del(Student student) {
        //String path = getFilesDir().getAbsolutePath() + File.separator + "stu.db";
        SQLiteDatabase db = studbOpenHelper.getWritableDatabase();
        //SQLiteDatabase.openOrCreateDatabase(path, null);

       /* 鍒犻櫎涔熸湁涓ょ 涓€绉嶆槸execSql()
       String sql = "delete from student where stuno = '"+student.getStuno()+"'";
       db.execSQL(sql);
       db.close();
       readDataFromDB();
       */

       /* 绗簩绉嶆槸浣跨敤delete鎺ュ彛
        String where = "stuno = '" + student.getStuno() + "'";
        db.delete("student", where, null);
        db.close();
        readDataFromDB();*/

        // 绗笁绉嶆槸浣跨敤delete鎺ュ彛
        String where = "stuno = ?";
        String[] argArray = {student.getStuno()};
        db.delete("student", where, argArray);
        db.close();
        readDataFromDB();
    }
    /**
     * 浠庢暟鎹簱璇诲彇瀛︾敓鍒楄〃
     */
    private void readDataFromDB() {
        //String path = getFilesDir().getAbsolutePath() + File.separator + "stu.db";
        SQLiteDatabase db = studbOpenHelper.getReadableDatabase();
        //SQLiteDatabase.openOrCreateDatabase(path, null);

        String sql = "create table if not exists student (stuno varchar(20), name varchar(20), age int)";
        db.execSQL(sql);

        studentArrayList.clear();
        Cursor cursor = db.query("student", null,null,
                null,null,null,null,null);

        if(cursor != null && cursor.getCount() > 0){
            for(cursor.moveToFirst(); !cursor.isAfterLast(); cursor.moveToNext()){
                String stuno = cursor.getString(0);
                String name = cursor.getString(1);
                int age = cursor.getInt(2);

                Student  student = new Student(stuno, name, age);
                studentArrayList.add(student);
            }
        }

        adapter.notifyDataSetChanged();

        cursor.close();
        db.close();
    }
}
